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 But it can be quite tedious to track every nutrient manually, so people typically rely on some sort of general ''food guide''. By averaging enough different foods together, hopefully most nutrients will fall into their optimal ranges. But to really know for sure, you can check with the [[nutrition calculator]] (https://olam.wiki/nutrition.html).
 ===Energy===
-The human body uses food as '''fuel'''. This is measured in '''Calories''' ([[Term:kalories|sometimes spelled "'''kalories'''" for disambiguation]]).
+The human body uses food as fuel.
+This is measured in '''Calories''' ([[Term:kalories|sometimes spelled "'''kalories'''" for disambiguation]]).
@@ Line 23: / Line 26: @@
 * Protein (amino acids) : '''4''' [[Term:kalories|kalories]] per gram {{x|varies slightly}}
 The body can also burn a few other miscellaneous things, such as alcohol ('''7''' [[Term:kalories|kalories]] per gram).
+{{null|
+In general, the exact proportion of protein/fats/carbs doesn't matter too much,
+* as long as the total amount of calories is reasonable, and
+* as long as the body gets enough protein, and
+* as long as the body gets a bare minimum amount of fat, and
+* as long as the body gets enough vitamins and minerals.
+}}
 ===Protein===
+The body needs a certain amount of protein, which typically accounts for about 10% to 25% of total calories. The rest can come from carbs and fats (the exact proportion of which doesn't matter too much).
+====Protein quality====
+There is a lot of confusing information about this, but it all boils down to:
+* There is a recommended daily amount of ''total protein''.
+* There is ''also'' a recommended daily amount of ''each essential amino acid''.<br />{{p2|<small>(see background knowledge)</small>|- Proteins are made of ''amino acids''.<br />- There are about 20 different amino acids, 9 of which are ''essential''.<br />- The body still needs the non-essential ones, but it can (if it needs to) convert essential amino acids into non-essential ones. The conversion can't go in the other direction.}}
+It's not hard to meet both recommendations, just by eating a variety of proteins. A [[plant-based]] diet should generally include both ''grains'' and ''legumes''.
+Another factor in protein quality is ''digestibility'', but this is [[digestibility|not an issue if the food is cooked properly]].
+===Fats===
+The body needs to eat ''some'' fat, for two reasons:
+* To absorb fat-soluble vitamins (A, D, E, and K), these vitamins must be eaten with fat.
+* There are essential fatty acids: omega-3 and omega-6.
+For these 2 purposes, the amount of fat the body needs is fairly small - typically less than 10% of total calories.
+''Hence a healthy diet's protein/fat/carb ratio can vary widely and still be healthy. As long as you get enough protein and fat, the other 80% of calories can come from carbs, or more fats, or more protein (to a limited extent - ''too much'' protein can be hard on kidneys).''
+===Fiber===
+Fiber is not absorbed by the body, but needed for healthy digestion.
+===Vitamins and minerals===
+It's important to get enough {{x|but not too much. Luckily, there's a wide range for most of these.}} of ''every'' nutrient on this list:
+Macro minerals (electrolytes):
+* Potassium
+* Chloride
+* Sodium
+* Calcium
+* Phosphorous
+* Magnesium
+Trace minerals:
+* Iron
+* Zinc
+* Manganese
+* Copper
+* Selenium
+* Iodine
+Vitamins: &nbsp; {{p2|(wondering about missing letters?)|Over the last century, some vitamins have been renamed; hence some numbers and letters are missing.<br />But this list is (hopefully) the full list of all known vitamins. If you think I missed any, please mention it in the {{talk}}.}}
+* A
+* C (Ascorbic acid)
+* D
+* E (Tocopherols)
+* K
+* B1 (Thiamin)
+* B2 (Riboflavin)
+* B3 (Niacin)
+* B5 (Pantothenate, or pantothenic acid)
+* B6 (Pyridoxine)
+* B7 (Biotin)
+* B9 (Folate, or folic acid)
+* B12 (Cobalamin)
+====Supplements====
+A ''daily multivitamin'' supplement can usually provide your full recommended daily intake of all vitamins and ''trace minerals'' - for quite cheaply (about 15 cents/day). But they can't provide enough of the ''macro minerals (electrolytes)''. That's because: if it did, the pill would be so big that you couldn't swallow it.
+Hence you need to get most of your ''macro minerals'' from [[food]] - especially from vegetables and [[legumes]].
+There's a common ''misconception'' that "synthetic vitamins are useless, you have to get all your nutrients from food". That is ''not'' true.
+But what ''is'' true, is that supplements can't completely ''replace'' food, for the reason mentioned. {{x|In theory, you could supplement everything including protein and calories, but it would get a lot more expensive than just eating food. You'd also miss out on the thousands of other substances naturally found in plants, which aren't ''technically'' nutrients but probably have some health benefits.}}
+One way to eat healthy is to eat the cheapest whole [[plant-based]] ingredients available, and take a multivitamin.
+===Choline===
+Scientists are still uncertain whether or not this nutrient is truly ''essential'' {{x|some studies suggest that the average healthy body can produce enough choline on its own, but others suggest that some people need to get their choline from food.}}. I recommend to try and hit the targets of other nutrients, and if choline falls short, don't worry about it.
+==Nutrient targets==
+''This page is incomplete. This will be filled in soon.''
+For easy tracking of nutrients, check out the [https://olam.wiki/nutrition.html nutrition calculator].
+==See also==
+* Food